C++ Programming/Code/Standard C Library/Functions/sprintf

sprintf #include <cstdio> int sprintf( char *buffer, const char *format, ... ); The sprintf() function is just like printf(), except that the output is sent to buffer. The return value is the number of characters written. For example: char string[50]; int file_number = 0; sprintf( string, "file.%d", file_number ); file_number++; output_file = fopen( string, "w" ); Note that sprintf() does the opposite of a function like atoi() -- where atoi() converts a string into a number, sprintf() can be used to convert a number into a string. For example, the following code uses sprintf() to convert an integer into a string of characters: char result[100]; int num = 24; sprintf( result, "%d", num ); This code is similar, except that it converts a floating-point number into an array of characters: char result[100]; float fnum = 3.14159; sprintf( result, "%f", fnum ); Related topics fprintf - printf(Standard C String and Character) atof - atoi - atol